Anja Murray: Jellyfish to watch out for and ones you don't need to be afraid of

These smugairle róin (translates from Irish as 'seal snot') seem to be on the increase, although in the absence of monitoring and data about jellyfish distribution and abundance, it is hard to know for sure

Close up view of a moon jellyfish

Swimming in the sea is always an invigorating experience. There’s the colour of the water — teal blue and turquoise green, made so by microscopic photosynthesising phytoplankton and their chlorophyll, harvesting sunlight and spinning it into energy that is the basis of marine food chains.

Sometimes seaweeds tickle the legs, long fronds of sea spaghetti reaching up toward the light. These are a reminder of all the unknowns beneath the surface, ecosystems teeming with life.